Photographic flash trigger



FIG. 1 is a front view of a photographic flash trigger;

FIG. 2 is a rear view thereof;

FIG. 3 is a left view thereof;

FIG. 4 is a right view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The broken line showing of the flash trigger forms no part of the claimed design. 

CLAIM The ornamental design for a photographic flash trigger, as shown and described. 